接下来，各位考生就和前程百利小编一同来学习GRE阅读写作用意题型的星座解析!在十二星座中， 处女座的特色就是有丰富的知性，做事一丝不苟，有旺盛的批判精神，并且有特殊的评论能力，喜欢对事情细致的分析、批判。强调完整性，不喜欢半途而废;对任何事都有一套详细的规划，然后一步接一步的实施并直到完全掌握。与十二星座中处女座星象相匹配的GRE阅读题型当属写作用意类。此类题型是针对文章中的某些内容进行提问，换句话说，就是题干中某个具体事物出现时，作者的用意是什么?通常作者提到的事物在文章有以下几种关系：支持、证明、解释或者反对某种观点。分分学生的命根，在备考GRE考试前期需要掌握扎实的GRE阅读技巧，并进行专项练习真题，以便完胜GRE考试!
接下来我们一起来学习以下有关作者写作用意的GRE阅读文章吧!
Aided by the recent ability to analyze samples of air trapped in glaciers, scientists now have a clearer idea of the relationship between atmospheric composition and global temperature change over the past 160,000 years.5) In particular, determination of atmospheric composition during periods of glacial expansion and retreat (cooling and warming) is possible using data from the 2,000-meter Vostok ice core drilled in Antarctica. The technique involved is similar to that used in analyzing cores 10) of marine sediments, where the ratio of the two-common isotopes of oxygen, 12O and 16O, accurately reflects past temperature changes. Isotopic analysis of oxygen in the Vostok core suggests mean global temperature fluctuations of up to 10 degrees centigrade over the past 15) 160,000 years.
Data from the Vostok core also indicate that the amount of carbon dioxide has fluctuated with temperature over the same period: the higher the temperature, the higher the concentration of carbon dioxide and the 20) lower the temperature, the lower the concentration. Although change in carbon dioxide content closely follows change in temperature during periods of deglaciation it apparently lags behind temperature during periods of cooling. The correlation of carbon dioxide 25) with temperature, of course, does not establish whether changes in atmospheric composition caused the warming and cooling trends or were caused by their.
The correlation between carbon dioxide and temperature throughout the Vostok record is consistent and 30) predictable. The absolute temperature changes, however, are from 5 to 14 times greater than would be expected on the basis of carbon dioxide’s own ability to absorb infrared radiation, or radiant heat. This reaction suggests that, quite aside from changes in heat-trapping gases, 35) commonly known as greenhouse gases, certain positive feedbacks are also amplifying the temperature change. Such feedbacks might involve ice on land and sea, clouds, or water vapor, which also absorb radiant heat.
Other data from the Vostok core show that methane 40) gas also correlates closely with temperature and carbon dioxide. The methane concentration nearly doubled, for example, between the peak of the penultimate glacial period and the following interglacial period. Within the present interglacial period it has more than doubled in 45) just the past 300 years and is rising rapidly. Although the concentration of atmospheric methane is more than two orders of magnitude lower than that of carbon dioxide, it cannot be ignored: the radiative properties of methane make it 20 times more effective, molecule for 50) molecule, than carbon dioxide in absorbing radiant heat. On the basis of a simulation model that climatological researchers have developed, methane appears to have been about 25 percent as important as carbon dioxide in the warming that took place during the most recent glacial retreat 8,000 to 10,000 years ago.
The author mentions “certain positive feedbacks” (lines 35-36) in order to indicate that
(A) increased concentration of carbon dioxide in the Earth’s atmosphere is responsible for global temperature increase.
(B) some climate simulation models have produced useful information.
(C) greenhouse gases alone do not account for global temperature increase.
(D) variables that benefit life are causing global temperature to increase.
(E) beneficial substances that are not heat- trapping gases and that contribute to global temperature increase have been found in the Vostok ice core.
这道题就属于典型的写作用意题，同时又给了特定的行数。这篇文章主要讲述的是科学家对冰川中的气体样本进行分析得出的一系列结论。考题考察的是作者 L35-36中提到的“正反应机制”在文章的目的，看原文，说明该词的句子就是该句本身。这个现象证明，除了能吸收热量的气体——即通常所说的“温室”气体的变化之外，其他一些正反应机制也加重了温度的变化。因此得出C正确，温室气体本身尚不能解释全球气温上升。
以上就是GRE阅读写作用意题型的星座解析，希望考生可以同十二星座中的处女座一样，做事周到、细心、谨慎而有条理，非常理性的面对GRE阅读，并祝愿广大考生取得理想的GRE成绩。
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